75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <string>
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// const_reference operator[](size_type pos) const; // constexpr since C++20
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// reference operator[](size_type pos); // constexpr since C++20
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#include "min_allocator.h"
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template <class S>
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TEST_CONSTEXPR_CXX20 void test_string() {
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S s("0123456789");
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const S& cs = s;
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ASSERT_SAME_TYPE(decltype(s[0]), typename S::reference);
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ASSERT_SAME_TYPE(decltype(cs[0]), typename S::const_reference);
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LIBCPP_ASSERT_NOEXCEPT(s[0]);
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LIBCPP_ASSERT_NOEXCEPT(cs[0]);
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for (typename S::size_type i = 0; i < cs.size(); ++i) {
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assert(s[i] == static_cast<char>('0' + i));
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assert(cs[i] == s[i]);
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}
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assert(cs[cs.size()] == '\0');
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const S s2 = S();
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assert(s2[0] == '\0');
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}
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// Same, but for the string that doesn't fit into SSO.
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template <class S>
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TEST_CONSTEXPR_CXX20 void test_string_long() {
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S s("0123456789012345678901234567890123456789");
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const S& cs = s;
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ASSERT_SAME_TYPE(decltype(s[0]), typename S::reference);
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ASSERT_SAME_TYPE(decltype(cs[0]), typename S::const_reference);
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LIBCPP_ASSERT_NOEXCEPT(s[0]);
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LIBCPP_ASSERT_NOEXCEPT(cs[0]);
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for (typename S::size_type i = 0; i < cs.size(); ++i) {
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assert(s[i] == static_cast<char>('0' + (i % 10)));
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assert(cs[i] == s[i]);
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}
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assert(s[33] == static_cast<char>('0' + (33 % 10)));
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assert(cs[34] == s[34]);
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assert(cs[cs.size()] == '\0');
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const S s2 = S();
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assert(s2[0] == '\0');
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}
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TEST_CONSTEXPR_CXX20 bool test() {
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test_string<std::string>();
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#if TEST_STD_VER >= 11
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test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
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test_string_long<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
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#endif
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return true;
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}
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int main(int, char**) {
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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